[PATCH 6/6] scsi: storvsc: Allow write_same when host is windows 10

[Long Li]

> -----Original Message-----
> From: devel [mailto:driverdev-devel-bounces at linuxdriverproject.org] On
> Behalf Of K. Y. Srinivasan
> Sent: Friday, May 29, 2015 1:29 PM
> To: gregkh at linuxfoundation.org; linux-kernel at vger.kernel.org;
> devel at linuxdriverproject.org; ohering at suse.com; jbottomley at parallels.com;
> hch at infradead.org; linux-scsi at vger.kernel.org; apw at canonical.com;
> vkuznets at redhat.com; jasowang at redhat.com
> Cc: Keith Mange
> Subject: [PATCH 6/6] scsi: storvsc: Allow write_same when host is windows 10
> 
> From: keith.mange at microsoft.com <keith.mange at microsoft.com>
> 
> Allow WRITE_SAME for Windows10 and above hosts.
> 
Reviewed-by: Long Li <longli at microsoft.com>
> Tested-by: Alex Ng <alexng at microsoft.com>
> Signed-off-by: Keith Mange <keith.mange at microsoft.com>
> Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>
> ---
>  drivers/scsi/storvsc_drv.c |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index
> 58fa47a..021cbdf 100644
> --- a/drivers/scsi/storvsc_drv.c
> +++ b/drivers/scsi/storvsc_drv.c
> @@ -1488,7 +1488,8 @@ static int storvsc_device_configure(struct
> scsi_device *sdevice)
> 
>  	/*
>  	 * If the host is WIN8 or WIN8 R2, claim conformance to SPC-3
> -	 * if the device is a MSFT virtual device.
> +	 * if the device is a MSFT virtual device.  If the host is
> +	 * WIN10 or newer, allow write_same.
>  	 */
>  	if (!strncmp(sdevice->vendor, "Msft", 4)) {
>  		switch (vmstor_proto_version) {
> @@ -1497,6 +1498,9 @@ static int storvsc_device_configure(struct
> scsi_device *sdevice)
>  			sdevice->scsi_level = SCSI_SPC_3;
>  			break;
>  		}
> +
> +		if (vmstor_proto_version >=
> VMSTOR_PROTO_VERSION_WIN10)
> +			sdevice->no_write_same = 0;
>  	}
> 
>  	return 0;
> --
> 1.7.4.1
> 
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